GEOLOGICAL SOCIETY. 77 



perfectly correspond, being exceedingly thick, short, 

 and blunt. Length of one these teeth, two inches, 

 diameter at base one inch 5 only one-half an inch pro- 

 jecting beyond the alveole. 



We have seen a portion of the jaw of a very distinct 

 species of fossil crocodile, in possession of Dr. J. E. De- 

 kay, who is about to describe it in the Annals of the 

 Lyceum of Natural History ; this fossil is also from the 

 Atlantic secondary in New Jersey ; it displays consi- 

 derable analogy with the Crqcodilus gangeticus of 

 Cuvier. 



Genus Plesiosaurus, of Coneybeare. 



The fossil vertebrae of a Plesiosaurien reptile, from 

 the New Jersey u marl," is contained in the Cab. of 

 Ac. Nat. Sciences, which we have described in the 

 Journal of the Academy, vol. iv. p. 232, pi. xiv. Al- 

 though the general character of this vertebra associates 

 it with the plesiosaurus, yet the comparative great 

 length of the axis of the bone will distinguish it from 

 any species of that genus hitherto noticed. 



Genus Basilosaurus, Harlan. 



A name we have used to distinguish the remains of 

 of an immense fossil saurian recently discovered on the 

 banks of the Washita, or u Ouachita," river, state 

 of Louisiana, and described in the Trans. Am. Philos. 

 Soc. vol. iv. new series, p. 297 pi. xx. 1834. 



The principal fossil which forms the subject of this 



